#include<stdio.h>
#include<unistd.h>
#include<sys/types.h>

int main()
{ 
    printf("begin: 我是一个进程，pid: %d,ppid: %d\n",getpid(),getppid());
   
    sleep(5);
    pid_t id = fork();
    
    if(id == 0)
    {
        //子进程
        while(1)
        {
            printf("我是子进程，pid: %d, ppid: %d\n",getpid(),getppid());
            sleep(1);
        }
    }
    else if(id > 0)
    {
        //父进程
        while(1)
        {
            printf("我是父进程，pid: %d, ppid: %d\n",getpid(),getppid());
            sleep(1);
        }
    }

    else
    {
        //error
    }

   return 0;
}

    ////pid_t id = getpid();
    //while(1)
    //{
    //    printf("I am a process,my id is: %d,parent: %d\n", getpid(),getppid());
    //    sleep(1);
    //}
